Didn't you get a user's manual with it? I have a VDO electric speedo and it has a series of dip switches on the back of the head. To calbrate it, I just drive the car in a controlled area (follow someone at 60mph or in a measured mile), ratio my speedo reading to 60 mph, then go into the documentation to find the settings on the dip switches to calibrate the speedo. Works great. If I change tire sizes, it's a snap to recalibrate.

 

He's right again. I have one in my truck. I set it by following my wife, let my buddy drive while I held the speedo in my hand. There are a series of "buttons" on the back. You just set the correct one!

 

You fellas are both right of course! I was trying to eliminate driving the measured 5 miles and then refering to the calibration chart and setting the 16 switches
The 5 miles must be done with a correct speedo,and then mine must be calibrated to that distance.It worked out fine.
Thanks
Ron

[ December 04, 2002: Message edited by: Ron Fowler ]</p>